.hero {
    text-align: center;
    padding: 2rem 0;
}

.hero h1 {
    margin: 0 0 0.5rem 0;
    font-size: 2rem;
    color: var(--primary-color);
}

.hero p {
    color: var(--text-secondary);
    margin: 0;
}

.tool-section {
    max-width: 1200px;
    margin: 0 auto;
}

.tool-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.tab-button {
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.tab-button.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-button:hover {
    color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.diff-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
}

.input-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.input-group textarea {
    min-height: 200px;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    resize: vertical;
    background: var(--input-bg);
    color: var(--text-primary);
}

.input-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

.controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: var(--button-bg);
    color: var(--button-text);
}

.btn-primary:hover {
    background: var(--button-hover);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--input-bg);
}

.options {
    display: flex;
    gap: 1rem;
    margin-left: auto;
}

.options label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
}

.options input[type="checkbox"] {
    margin: 0;
}

.diff-result {
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    max-height: 600px;
    overflow: auto;
    min-height: 100px;
}

.diff-result:empty::before {
    content: "Diff results will appear here...";
    color: var(--text-secondary);
    font-style: italic;
    padding: 1rem;
    display: block;
}

.diff-container-side-by-side {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 400px;
}

.diff-panel {
    border-right: 1px solid var(--border-color);
    overflow: auto;
}

.diff-panel:last-child {
    border-right: none;
}

.diff-panel-header {
    background: var(--card-bg);
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border-color);
    font-weight: 500;
    color: var(--text-primary);
    position: sticky;
    top: 0;
    z-index: 1;
}

.diff-panel-content {
    padding: 0;
}

.diff-line {
    display: flex;
    align-items: flex-start;
    padding: 0.125rem 0;
    margin: 0;
    min-height: 1.5em;
    border-bottom: 1px solid transparent;
}

.diff-line:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .diff-line:hover {
    background-color: rgba(255, 255, 255, 0.02);
}

.diff-line-number {
    display: inline-block;
    width: 50px;
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-align: right;
    padding: 0 0.5rem;
    flex-shrink: 0;
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
}

.diff-line-content {
    flex: 1;
    padding: 0 0.75rem;
    white-space: pre-wrap;
    word-break: break-all;
}

.diff-line-added {
    background-color: rgba(34, 197, 94, 0.1);
}

.diff-line-added .diff-line-number {
    background-color: rgba(34, 197, 94, 0.15);
    color: #16a34a;
}

.diff-line-added .diff-line-content {
    color: #16a34a;
}

.diff-line-removed {
    background-color: rgba(239, 68, 68, 0.1);
}

.diff-line-removed .diff-line-number {
    background-color: rgba(239, 68, 68, 0.15);
    color: #dc2626;
}

.diff-line-removed .diff-line-content {
    color: #dc2626;
}

.diff-line-unchanged {
    color: var(--text-primary);
}

.diff-line-empty {
    background-color: rgba(100, 116, 139, 0.05);
}

.diff-line-empty .diff-line-content {
    color: var(--text-secondary);
    font-style: italic;
}

.json-error {
    color: #dc2626;
    background-color: rgba(239, 68, 68, 0.1);
    padding: 0.5rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .input-section {
        grid-template-columns: 1fr;
    }
    
    .controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .options {
        margin-left: 0;
        justify-content: center;
    }
    
    .hero h1 {
        font-size: 1.5rem;
    }
    
    .diff-container-side-by-side {
        grid-template-columns: 1fr;
        max-height: none;
    }
    
    .diff-panel {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .diff-panel:last-child {
        border-bottom: none;
    }
    
    .diff-line-number {
        width: 40px;
        font-size: 0.7rem;
    }
}